Answer:
Both
Step-by-step explanation:
They will both give you the same answer.
-13-5 = -18
-13 + -5 = -18
She will need 12 seconds because -20•12=-240
The answer to number 18 is - 0.25 or 1/4
If you need help with the other ones ask.
<em>Hope this will help :)</em>
13/4-11/6=17/12 your answer